Ford 2003 Mustang Workshop Manual page 90

Transmission
growling/humming—
noise occurs in the
forward gears. The
noise is more
prominent when the
gear is loaded. The
problem gear can be
located as the noise
occurs in a specific
gear position
Transmission
hissing—noise in
neutral or in forward
gears. As bearings
wear or break up, the
noise changes to a
thumping noise
Transmission
knocking/thudding—
noise at low speeds in
forward gears
Transmission
rumble/growl—noise at
higher speeds in
forward gears, more
pronounced in a
coast/deceleration
condition
Mismatched gear
sets.
Damaged or worn
transmission
bearing.
Gear is cracked,
chipped or rough.
Damaged or worn
bearings.
Bearings with
damaged balls or
rollers or with pitted
and spalled races.
Incorrect driveline
angle.
Driveshaft out of
balance or
damaged.
INSPECT the gear sets
for an uneven wear
pattern on the face of
the gear teeth. REPAIR
as necessary. REFER
to Section 308-03A for
T50D transmissions or
Section 308-03B for
TR3650 transmissions.
INSPECT the
transmission bearings.
INSTALL new bearings
as necessary. REFER
to Section 308-03A for
T50D transmissions or
Section 308-03B for
TR3650 transmissions.
INSPECT the
transmission gears for
damage or wear.
INSTALL new gears as
necessary. REFER to
Section 308-03A for
T50D transmissions or
Section 308-03B for
TR3650 transmissions.
INSPECT the
transmission bearings.
INSTALL new bearings
as necessary. REFER
to Section 308-03A for
T50D transmissions or
Section 308-03B for
TR3650 transmissions.
INSPECT the
transmission bearings.
INSTALL new bearings
as necessary. REFER
to Section 308-03A for
T50D transmissions or
Section 308-03B for
TR3650 transmissions.
CHECK the driveline
angle. REPAIR as
necessary. REFER to
Section 205-00 .
CHECK the driveshaft
for damage, missing
balance weights or
undercoating. Using the
vibration analyzer (VA),
CHECK the driveshaft
balance. CARRY OUT
a driveline vibration
test. For additional